ethics is nothing more than a manifestation of a dual mind
what is good? what is evil? are they not concepts conjured up by a dual mind?
in the eyes of a truly enlightened mind, nothing is truly good or evil...
I watched a movie called "Anonymous" the other time and in this mythical story it showed a context where writing was considered sinful and lowly - the Shakespeare character had to hide himself because he was doing the work of devilry. I found that interesting. In some ages/societies sex is banned except under certain conditions, in some societies today same-sex sex is looked down upon, legalised, or illegal depending on where you sit. In ancient China as I understand it, a woman should not even reveal her bare arm or leg yet today mini shorts abound. People who were deemed to have affairs were taken, witch hunt style, down to the river to be drowned.Today we would call the witch hunt folk the criminals whereas in those days they were just the good, ethical people shouting down the 'sins' of the adulterers.
Yes the reality is ethics unfolds and it is contextual to a large degree, although a society enmeshed in that is unlikely to see through those veils - because well it is always harder to see when you are within the mesh.
It brings up a polar question though which is does this mean we can do anything we want and it doesn't matter? And the answer is of course not - of course there is a context and a connotation and an implication/ramification to all that we do.
Likewise, a human being if they are reasonable and open and closer to their Buddha nature-nature they have the tools and natural instinct to judge. For example your child falls, sometimes it is OK to let them fall and hurt a bit to learn and sometimes care and warmth is required. In other cases, you can scold your child or a teacher can teach their students a lesson - the student is hurt or the child is angry/bitter, but if the heart is clear/warm/compassionate, then there is a natural basis to know what is so...of course it takes a lot of attention, awareness, reflection: but these things are possible. On the outside, can you tell?
And whilst rule books and the like can claim certain boundaries, the situation of humans is far more complex. Generally though in Buddhism we have precepts and those precepts are general guidelines in which to keep humans morally grounded whilst they uncover and realise their true nature - which is one of the ultimate goals in Buddhism as far as I know.
So I would say that to speculate on what is an enlightened mind is or does is probably not so fruitful, but if the layers of conditioning are unfolded, it is a better state IMO and I would agree that some care is warranted in this field of ethics.